with every bit of technology, night vision gear and sensors they can get their hands on, the group travels the world, investigating big foot sightings. why are people fascinated by big foot? >> well, first it is more than one, it's not big foot, it's big foots. there's a misconception out there that we're looking around for this one thing. >> reporter: adventures and investigations make up two and soon to be three seasons of the animal planet show "finding big foot." why is there no good photo or video? the famous photo and film to go with it known as the patterson-gimlin film taken in 1967. to our surprise it is no joke to the big foot crew which studied it and tried to re-create it to determine if it was staged. you mow, most people look at this and say there's a guy in a suit? >> well, they're wrong. it has much more muscle mass. see it in motion. parts of anatomy. if you know what a person looks like, and you know that doesn't look like a person in a costume. that looks like a real animal. >> reporter: they studied tracks too. >> oh, yeah. >> reporter: said they say of an unidentified